松井俊憲 (富山大学) Toshinori Matsui (Toyama University)
Gravitational waves as a probe of extended scalar sectors with the first order electroweak phase transition Gravitational waves as a probe of extended scalar sectors with the first order electroweak phase transition
宇宙の物質・反物質非対称性の問題は、素粒子標準理論の枠組みでは説明できない現象である。ヒッグス物理で説明される電弱バリオン数生成のシナリオであれば、ILCなどの線形加速器でのヒッグス三点結合の測定で検証できることが知られている。しかし本講演では、それと独立に将来の重力波実験を用いた全く新しい検証法を提案する。電弱相転移起源の残存重力波の観測による拡張されたヒッグスセクターを含む新物理模型の検証可能性を議論する。本研究は、富山大学の兼村晋哉氏、柿崎充氏との共同研究に基づく。(Reference: PRD92, 115007 (2015) [arXiv:1509.08394 [hep-ph]])
We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogengesis. Such spectra are numerically evaluated in a set of extended scalar sectors with additional N isospin-singlet fields as a concrete example of renormalizable theories. We show the produced gravitational waves can be significant, so that they are detectable at future gravitational wave interferometers. Furthermore, we conclude that future detailed observation of gravitational waves can be generally useful as a probe of extended scalar sectors with the first order phase transition. This talk is based on Phys. Rev. D 92, 115007 (2015) [arXiv:1509.08394 [hep-ph]], with M. Kakizaki and S. Kanemura.